Mimic UIAlertView Bounce?

Question

Whats the best way to mimic the bouncing animation from the UIAlertView on the iPhone? Is there some built-in mechanism for this? The UIAlertView itself won\'t work for my n

Answer 1

UIAlertView uses a more sophisticated animation:

• scale to larger than 100%
• scale to smaller than 100%
• scale to 100%

Here's an implementation using a CAKeyFrameAnimation:

view.alpha = 0;
[UIView animateWithDuration:0.1 animations:^{view.alpha = 1.0;}];

CAKeyframeAnimation *bounceAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
bounceAnimation.values = @[@0.01f, @1.1f, @0.8f, @1.0f];
bounceAnimation.keyTimes = @[@0.0f, @0.5f, @0.75f, @1.0f];
bounceAnimation.duration = 0.4;
[view.layer addAnimation:bounceAnimation forKey:@"bounce"];